package com.yaoq.observer.improve;

/**
 * @ClassName Subject
 * @Description TODO
 * @Author yaoqiang
 * @Date 2020/9/3 14:59
 * @Version 1.0
 */
public interface Subject {
    public void registerObserver(Observer o);

    public void removeObserver(Observer o);

    public void notifyObservers();
}
